JPH11109293A - Production of ear bend of spectacle frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a process for producing ear bends having insertion holes insertable to temples of any sectional shapes by pouring a resin into the cabins formed in metal molds, molding the ear bends and simultaneously inserting arbors therein and molding the insertion holes before the resin cures completely. SOLUTION: The cabins 14 templating the ear bends are formed at four points in the metal molds 13 and the resin flowing into the cabins from a nozzle port 17 flows through gates 16 from a runner 15 into the cabins 14. The inflow of the resin is stopped slightly before the cabins 14 are completely filled. Where the arbors 11 are heated by heaters 12, the arbors are inserted from openings 18 into the cabins 14 and are inserted into the central axes of the molded ear bends. Where the resin cures to some extent, the arbors 11 are pulled off and the molded ear bends 1 are taken out integrally with the runner 15 therefrom by opening of the metal molds. The insertion holes are molded to the same shape as the shape of the front ends of the temples by the shapes of the arbors 11 and, therefore, the mounting to any front end shape is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a modern to be inserted into a crane end of an eyeglass frame.

[0002]

2. Description of the Related Art An eyeglass frame is a kind of tool for holding a lens and hanging it on a face. Therefore, it is necessary that the frame is easy to wear, light, and does not cause fatigue even when worn for a long time. Therefore, in recent years, titanium materials, etc., which are very light and highly springy, have been frequently used as materials for metal eyeglass frames. However, not only such functional requirements, but also the eyeglass frames can be worn on the face. From the above, the fashionability is high, and therefore, the eyeglass frame is generally subjected to decorative processing as secondary processing.

[0003] This is not only the front frame,
The same applies to the vine, for example, when plating the vine,
Since plastic moderns are deformed by the heat associated with the plating process, they are often processed without being inserted, and are often attached to the ends of the crane after plating. Therefore, a hole for insertion is formed in the core of the modern, and the insertion hole has been conventionally drilled. However, as is well known, drilling can only drill holes with a circular cross section, and the cross-sectional shape of the tip of the vine is naturally limited to a circular cross section, much less modern insertion holes for vines with different cross-sectional sizes and shapes. Was impossible.

[0004]

The above-mentioned problems exist in the method of manufacturing a modern that is inserted into the end of the vine of the eyeglass frame as described above. The problem to be solved by the present invention is this problem, and provides a modern manufacturing method having an insertion hole that can be inserted into a crane having any cross-sectional shape.

[0005]

The modern object of the present invention is injection-molded. A resin is poured into a cabin formed in a mold and molded. At the same time, a core is inserted before the resin is completely cured. Form the insertion hole. The length and cross-sectional shape of the core metal are not particularly limited, and may be a circular cross section,
It has a square cross section. Molded moderns that are not completely cured are relatively soft, the core is easily inserted without bending and the core is removed after a short cooling time.

[0006] The core is also heated to make it easier to insert, and a heater is provided near the mold for that purpose.
At the same time as the modern molding, the core is heated and inserted through an opening provided in the side surface of the mold. Therefore, since the opening of the cored bar communicates with the cabin, the injection of the resin is stopped before filling the cabin so that the resin flowing from the runner through the gate does not flow out of the opening. Then, the cabin is fully filled with the core metal inserted, and a predetermined modern is formed. Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

[0007]

FIG. 1 shows a concrete example of a modern that is inserted into a vine of a spectacle frame. The modern 1 is inserted into a tip of a vine 2 as shown in FIG. Can be bent moderately. Modern 1 has a feature in the insertion hole 3,
The length and external shape of the Modern 1 are not limited. By the way, the insertion hole 3 is formed on the central axis of the modern 1 from the insertion end 4 to the tip. The cross-sectional shape of the insertion hole 3 is different between the region A and the region B. In the region A, an oblong insertion hole 3a is formed, and in the region B, a circular insertion hole 3b is formed.
Are formed respectively, and both the insertion holes 3a and 3b are on a concentric axis and are continuous.

As described above, the insertion hole 3a of the crane has a circular cross section and cannot be drilled. However, in the present invention, the insertion hole is formed by inserting a core during modern molding. Therefore, if the cross section of the metal core is made the same as the crane cross section, there is no problem even if the insertion hole has a non-circular cross section.

FIG. 2 is an embodiment showing an apparatus for manufacturing a modern according to the present invention. The modern is molded by injecting a resin into a mold. The mold includes an upper mold 5 and a lower mold 6, and a resin is injected into the mold to form a modern cabin. Nozzle 7 for feeding resin
Is provided. Then, the upper die 5 moves up and down to open and close the cabin, descends and closes the cabin, injects resin from the nozzle 7 to fill the cabin.

An air cylinder 8 is arranged next to the mold, and a slider 10 which is slid by a piston rod 9 of the air cylinder 8 is provided.
A core metal 11 is attached to 0 and extends horizontally. A heater 12 is provided between the slider 10 and the mold, and the core 11 is located between the upper and lower heaters and is heated by both heaters. The heated core 11 is inserted into the mold by the projection of the piston rod 9 of the air cylinder 8.

FIG. 3 is a plan view showing a case where the core metal 11 is inserted into a place where a resin is filled in a mold cabin. The mold 13 is provided with cabins 14, 14... In the form of a modern in four places, and these cabins 14, 14.
Are connected to the runner 15 via gates 16, 16,.... The resin flowing from the nozzle port 17 flows into the cabin 14 from the runner 15 through the gate 16, and the cabin 14 is filled.

Although the resin flows into the cabin 14, the opposite side of the gate 16 is opened so that the cored bar 11 is inserted, so that the resin does not flow out of the opening 18, ie, the cabin 14 Shortly before the resin is completely filled, the inflow of the resin is stopped. Then, when the mandrel 11 is heated by the heater 12, the mandrel 11 is inserted into the cabin 14 from the opening 18 and inserted into the center shaft of the formed modern. The resin filled in the cabin 14 is soft, and the core 11 is inserted without bending.

The core metal 11 inserted into the molding modern is stopped for a predetermined time as it is, and when the resin has hardened to some extent, the core metal 11 is pulled out, and then the molds 1, 2,. Is taken out together with. Each modern 1,... Is separated from the gates 16, 16,..., And the end where the crane insertion hole is opened is crushed to close the insertion hole 3, and barrel polishing is performed to polish the surface. That is, the end is crushed to close the opening 18 in order to prevent the abrasive from entering the insertion hole 3, and the end is cut after polishing.

FIG. 4 shows a nozzle of an injection molding machine. This nozzle can form a modern pattern by alternately injecting two colors of resin. Of course, in the present invention, the shape, pattern, material, and the like of the modern itself are not particularly limited, and molding is performed by inserting a core metal into the central shaft portion at the same time as the molding of the modern. The effect can be obtained.

[0015]

According to the modern manufacturing method of the present invention, since the insertion hole is formed in the same shape as the tip of the vine, depending on the shape of the cored bar, the tip can be inserted regardless of the shape of the tip. It is not limited only to the insertion hole with a circular cross section as in the past,
Even a polygonal cross section or a cross section having a different shape depending on the position as shown in FIG. 1 can be formed. Since the insertion hole is processed at the same time as the modern molding, that is, since the insertion hole is not processed in a separate process, the productivity of the modern is increased.

The molding die is provided with an opening into which the core is inserted. However, the resin does not flow out from the opening, and the modern end is crushed during finishing polishing to open the insertion hole. Can be closed, so that the abrasive does not enter the insertion hole. On the other hand, since the insertion hole is a formed hole and not a cut hole formed by drilling, a non-circular insertion hole can of course be obtained, but the surface roughness of the inner peripheral surface of the insertion hole can be obtained. Is very small, so that irregular reflection of light does not occur and transparency is improved. In conventional cutting holes, light was diffused and whitened, impairing the modern appearance.

[Brief description of the drawings]

FIG. 1 is a specific example of a modern having an insertion hole.

FIG. 2 is an apparatus for forming a modern and insertion hole.

FIG. 3 shows a case where a core is inserted into a mold cabin.

FIG. 4 is a nozzle for injecting two colors of resin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Modern 2 Crane 3 Insertion hole 4 Insertion end 5 Upper die 6 Lower die 7 Nozzle 8 Air cylinder 9 Piston rod 10 Slider 11 Core metal 12 Heater 13 Mold 14 Cabin 15 Runner 16 Gate 17 Nozzle port 18 Opening

Claims (2)

[Claims] 1. A resin molding modern manufacturing method manufactured by using a mold, wherein a slider which is slid by an air cylinder is provided next to the mold, and a core is attached to the slider. A heater for heating the core metal is provided between the slider and the slider, the resin is injected into the mold cabin and stopped before the cabin is completely filled, and the core metal is heated by the heater. A method for manufacturing a modern eyeglass frame, comprising: operating an air cylinder before the resin is cured to insert the core into the cabin through the opening of the mold to form an insertion hole. 2. A molding modern manufacturing method made of a resin, which is manufactured using a mold, wherein a slider which is slid by an air cylinder is provided next to the mold, and a core is attached to the slider. A heater for heating the core metal is provided between the slider and the slider, the resin is injected into the mold cabin and stopped before the cabin is completely filled, and the core metal is heated by the heater. At the same time, before the resin hardens, the air cylinder is operated to insert the core metal into the cabin from the opening of the mold to form an insertion hole, and crush the end of the molded modern removed from the mold to close the opening. A method for manufacturing a modern eyeglass frame, comprising: barrel polishing a surface, and thereafter cutting the end.